[backport] Remove IP address detection fallback

It was never used, the one-liner is enough.

openvpn-install.sh

@@ -83,13 +83,6 @@ newclient () {
 	echo "</tls-auth>" >> $homeDir/$1.ovpn
 }
 
-# Try to get our IP from the system and fallback to the Internet.
-# I do this to make the script compatible with NATed servers (LowEndSpirit/Scaleway)
-# and to avoid getting an IPv6.
-IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -o -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
-if [[ "$IP" = "" ]]; then
-	IP=$(wget -qO- ipv4.icanhazip.com)
-fi
 # Get Internet network interface with default route
 NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
 
@@ -220,6 +213,8 @@ else
 	echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
 	echo "If your server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP address as it is. (local/private IP)"
 	echo "Otherwise, it should be your public IPv4 address."
+	# Autodetect IP address and pre-fill for the user
+	IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
 	read -p "IP address: " -e -i $IP IP
 	echo ""
 	echo "What port do you want for OpenVPN?"